Correct toplogy spelling
Correct toplogy spelling

The heading had a spelling mistake with topology spelt toplogy.

Change-Id: Ie4e6aa2f2a275f1db7b427a1d3d584efed773beb
Closes-Bug: #1530429

openstack/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals